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Re: Potentiometer
Not all pots are linear. Some are called "audio taper and have a logarithmic function to adjust sound volume so turning the pot approximates what your ear perceives as linear. I've also run into some very strange special purpose pots made on the surplus market. These have a very odd response. Pots aren't that expensive. Go buy one that's linear, and of good quality if your arm's position is going to depend on it. Remember, if you are using a feedback circuit to help drive your arm, then the quality of the pot becomes a safety issue!
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